Show FINDS REASON FOR KNOCKS IN ENGINES ENGINE ENGINES Improperly Ignited Fuel Causes Second Explosion 4 W t 4 5 S 4 I WILLIAM HALE CHARCH By NEA Service COLUMBUS 0 July The lO-The 10 mystery ot of why a knock knocks Is solved William Hale Charch young le- le yc re research c search student at Ohio State uni university has done It and Is hailed by chemists or of o the me country as the savior ot of motorists nerves Charch has found out why tetra ethyl ethyl that lead lead that new knock anti anti compound over which there has been so much controversy kills controversy the knock In your our engine Ills reason redon Is so simple It Is believed to have cleared up the whole problem lem eID ot of combustion ot of fue fuel In the cylinders According to new lead In fn the theory the ethyl tetraethyl fuel breaks up suddenly Into at atoms oms ot of metallic lead in the course of ot the explosion And It ItIs itis ItIs Is these atoms of ot lead that pro pro- provide provide vide Ide flames for parts ot of o the gas that otherwise would explode s a little ater after the main explosion and thus produce the well known well knock With this knock antiknock compound It'll ft's all one detonation Charch finds An explosion consists ot of the flaming ot of o the gas and then the combustion It takes Just a fraction of ot a second But Dot In that frac traction on It if all gas doesn't burn burnat burnat burnat at the same time Ume It wont won't com corn bust bust at once and along comes the knock jl A knock occurs when theburn the the burn burning ing leg part ot of the mixture gas so 80 compresses the unburned portion that this unburned part becomes become hot enough to explode after explode after the main explosion Those little atoms ot of lead thrown out by the knock anti anti compound spread the tame name so I evenly and swiftly through the entire combustion chamber that there thero Is no chance tIr any part of at the fuel to remain unburned C v CO All AU the f fuel e burns and all ex explodes at t once n |